Aid Workers Rush to Help Syrians at Border

More than 35,000 face cold as world leaders press Turkey to open its gates

KILIS, Turkey—Aid workers rushed Sunday to provide shelter for more than 35,000 Syrians facing freezing temperatures and rain at the Turkish border as world leaders pressed Ankara to open its gates to a new surge of civilians seeking sanctuary from the fight for control of Syria’s largest city.

The new influx has been sparked by Russian airstrikes in Aleppo helping the Syrian army and fighters dispatched by Iran in their renewed quest to retake the city from antigovernment rebel groups, just as United Nations-sponsored peace...